UPDATE: The Knicks have made all the reporting official.
As had been expected, David Fizdale is out as the Knicks head coach after an ugly 4-18 start to the season. This was a case where Fizdale was given an "Island of Misfit Toys" roster to work with that was never going to be good, but he also didn't do much with it. New York had no identity on either side of the ball. The Knicks have lost eight straight, the last two by at least 37 points, and the team was simply lackadaisical in its effort recently.
Who will coach the Knicks next season depends on the answer to another question: Are team president Steve Mills and general manager Scott Perry safe, or are they on their way out, too?
In the short term, New York promoted Mike Miller into the big chair, and bring up Keith Bogans from the G-League coaching staff to round out the roster, something first reported by Shams Charania of The Athletic.
Miller spent four years as the head coach of the Westchester Knicks, the franchise's G-League affiliate, and was the G-League Coach of the Year for the 2017-18 season. He was eventually promoted to the Knicks bench.
Don't expect a major shake-up in the Knicks' offensive and defensive systems, or with the rotations, at least in the short term. There just are not a lot of practice days built into the NBA schedule to allow a mid-season replacement to overhaul everything. Plus, with this roster, there's only so much a human being can do.